CN2371393Y - Braking mechanism for speed variator - Google Patents

Abstract

The utility model relates to a braking mechanism for a speed variator. The utility model is characterized in that a slide sleeve, both sides of which are provided with claw-shaped teeth and the outer circle of which is provided with a groove, forms slip fit on a shaft by a key, a big gear, one side of which is provided with claw-shaped teeth capable of engaging with the teeth of the slide sleeve, forms clearance fit on the shaft, the inner side of an end cover is provided with claw-shaped teeth capable of engaging with the teeth of the slide sleeve, a press spring is arranged between the slide sleeve and the end cover, and the fork teeth of a shifting fork fixed on a box body are matched with the groove of the outer circle of the slide sleeve. The braking mechanism for speed variator has the advantages of simple structure, labor saving for operation, convenient operation and flexible steering, being widely suitable for small agricultural and transport machinery.

Description

The speed changer arrestment mechanism

The utility model relates to a kind of speed changer, particularly a kind of speed changer arrestment mechanism.

At present, the output shaft of small-sized speed changer of the prior art does not often have arrestment mechanism; Speed changer then generally all adopts outside mode of braking in the big-and-middle-sized gear.Like this, in small-sized particularly small-sized caterpillar belt formula farm machinery and Transport Machinery as use big-and-middle-sized speed changer, relatively difficulty is installed, simultaneously, use above which kind of speed changer phenomenons such as turning is difficult, radius of turn is uncontrollable then all can occur, cause the tractor driver to operate quite difficulty, had a strong impact on the working efficiency and the quality of machine.

The purpose of this utility model is to provide a kind of speed changer arrestment mechanism that adopts inner mode of braking, to be applicable to small agricultural machinery and Transport Machinery, make its can install, easy to operate, turn flexibly.

The purpose of this utility model is achieved in that this speed changer arrestment mechanism comprises that both sides are equipped with the mission case of end cap, be located in the casing about two covers fully symmetry pass end cap central bore and with the hole concentric and be bearing in the axle on the bearing 10,12 and import the gear of power into and be located at about gaps in the middle of two axles enclose.Be characterized in, about in casing, being provided with two covers fully symmetry with lower device: both sides are provided with the claw type tooth of dog-clutch, the sliding sleeve that cylindrical is provided with Baltimore groove preferably adopts the spline sliding fit on axle with key, promptly be linked on the axle, sliding sleeve can horizontally slip on axle.One side is provided with and can be linked on the axle with the gearwheel gap of the claw type tooth of sliding sleeve claw type tooth engagement, and promptly gearwheel is taked movingly with axle, and gearwheel can pivot.The inboard of end cap be provided with can with the claw type tooth of sliding sleeve claw type tooth engagement.Be provided with pressure spring between sliding sleeve and end cap inboard, the claw type tooth of the claw type tooth of gearwheel and sliding sleeve generally is in engagement under the effect of spring force, thereby drives the axle rotation, and power is exported through axle, and promptly speed changer is generally in running order.Be fixedly mounted on the prong of the shift fork on the casing and cooperate with Baltimore groove on the sliding sleeve cylindrical, promptly the shift fork tooth embeds in the Baltimore groove.Shift fork can be around self axis rotation.

Owing to adopt above structure, solved the inside mode of braking of speed changer preferably, this speed changer arrestment mechanism is simple in structure, is convenient to install, and rapid operation can be realized the speed changer working state flexibly easily Neutral state The conversion of halted state is widely applicable for various small-sized caterpillar belt formula farm machineries and Transport Machinery, makes its energy easy to operate, turn flexibly, thus the working efficiency and the quality of raising machine.

Below in conjunction with drawings and Examples the utility model is described in further detail.

Fig. 1 is the plan view of the utility model speed changer arrestment mechanism.

Fig. 2 is that the A-A of Fig. 1 analyses and observe rotation diagram.

Shown in Figure 1, the utility model speed changer arrestment mechanism comprises that the both sides of prior art respectively are equipped with the casing 1 of end cap 3, end cap is connected with casing 1 usefulness screw 7, outer side surface at end cap 3 is fixed with small end lid 5 with screw, cover 5 the insides at small end and be provided with axle envelope 4 in case leakage of oil, the symmetrical fully axle 13 of two covers about being provided with in the casing 1, bearing 10,12, gear 18, axle 13 is that lower velocity shaft is output shaft again, it passes and concentric and be bearing on bearing 10 and the bearing 12 with the hole from the center hole of end cap 3, import the gear 18 and gearwheel 9 engagements of power into, about be provided with gaps circle 11 in the middle of two axles 13, in case the mutual friction of two axle phases.The symmetrical fully following device of two covers about setting up in casing 1: both sides are provided with the claw type tooth 19 of dog-clutch, the sliding sleeve 8 usefulness keys that cylindrical is provided with Baltimore groove preferably adopt the spline sliding fit on axle 13, promptly be linked on the axle 13, sliding sleeve 8 can horizontally slip on axle 13, and claw type tooth 19 its angles of inclination are not more than 20 degree.One side is provided with and can be linked on the axle 13 with gearwheel 9 gaps of the curcumbitate tooth 20 of sliding sleeve claw type tooth 19 engagement, and promptly gearwheel 9 is taked movingly with axle 13, and gearwheel 9 can pivot.The inner side end of end cap 3 be provided with can with the claw type tooth 21 of sliding sleeve claw type tooth 19 engagement.Be provided with pressure spring 6 between sliding sleeve 8 and end cap 3 inboards, the claw type tooth 20 of gearwheel generally is in engagement with the claw type tooth 19 of sliding sleeve under the effect of spring force, thereby makes speed changer generally in running order.Shown in Figure 2, the prong 22 that is fixedly mounted on the shift fork 2 on the casing 1 cooperates with the Baltimore groove of sliding sleeve 8 cylindricals, and promptly shift fork tooth 22 embeds in the Baltimore groove.Declutch shift shaft 23 is linked in the sliding bearing 14, and driving lever 15 is located at the top of the outer shift fork 2 of casing, and the junction plane between declutch shift shaft 23 and sliding bearing 14 and sliding bearing 14 and overcoat is equipped with the round section joint ring 16,17 of sealing usefulness respectively.Shift fork 2 can be around self axis rotation.

Basic functional principle of the present utility model is as follows: power passes to gearwheel 9 by gear 18, gearwheel 9 rotates thereupon like this, supposed when this moment, sliding sleeve 8 was positioned at the neutral position of end cap 3 and gearwheel 9, gearwheel is around the axis rotation of axle, because gearwheel 9 is a Spielpassung with axle 13, power can not import axle 13 into, Gu axle does not rotate.If but had external force moment to impose on the lower velocity shaft 13 this moment, axle 13 could rotate freely.Be neutral position this moment.When stirring shift fork 2, sliding sleeve 8 is moved laterally, allow the claw type tooth 21 of end cap 3 and the pawl type tooth 19 of sliding sleeve 8 be meshing with each other, because end cap is fixed on the casing 1, sliding sleeve 8 just can't rotate, and sliding sleeve 8 is connected by spline with axle 13, thereby makes spools 13 also just can not rotate, and this position is application position.When the power that sheds shift fork 2, this moment, compression spring 6 promoted sliding sleeve 8 under the effect of spring force in casing central authorities, the pawl type tooth that has meshed is thrown off, and gearwheel 9 is meshed with the pawl type tooth 19 of sliding sleeve 8.Since gearwheel 9 rotations, thus drive sliding sleeve 8 rotations, drive axle 13 rotations thereupon, make power from axle 3 outputs, be the working position this moment.Because two shift forks 2 can be distinguished operation separately, thereby make various informativeization of power output and braking, carry out various required functions effectively.

Claims (2)

1, a kind of speed changer arrestment mechanism, comprise that both sides are equipped with the mission case of end cap (3) (1), be located in the casing (1) about two covers the passing end cap (3) and be bearing in the axle (13) on the bearing (10`12) and import the gear (18) of power into of symmetry fully, be located at the middle gap circle (11) of diaxon (13), it is characterized in that, about being provided with in the casing (1) two covers fully symmetry with lower device: the claw type tooth (19) of dog-clutch is established in both sides, cylindrical is established the sliding sleeve (8) of Baltimore groove and is used the key sliding fit on axle (13), one side is provided with and can be linked on the axle (13) with gear (9) gap of the claw type tooth (20) of sliding sleeve claw type tooth (19) engagement, end cap (3) inboard be provided with can with the claw type tooth (21) of sliding sleeve tooth (19) engagement, be provided with pressure spring (6) between sliding sleeve (8) and end cap (3), the prong (21) that is fixed on the shift fork (2) on the casing (1) cooperates with the Baltimore groove of sliding sleeve (8) cylindrical.

2, speed changer arrestment mechanism according to claim 1 is characterized in that: the key between sliding sleeve (8) and the axle (13) adopts spline.

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